WO2017159325A1 - Extender lens and imaging device - Google Patents
Extender lens and imaging device Download PDFInfo
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- WO2017159325A1 WO2017159325A1 PCT/JP2017/007523 JP2017007523W WO2017159325A1 WO 2017159325 A1 WO2017159325 A1 WO 2017159325A1 JP 2017007523 W JP2017007523 W JP 2017007523W WO 2017159325 A1 WO2017159325 A1 WO 2017159325A1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/02—Optical objectives with means for varying the magnification by changing, adding, or subtracting a part of the objective, e.g. convertible objective
- G02B15/10—Optical objectives with means for varying the magnification by changing, adding, or subtracting a part of the objective, e.g. convertible objective by adding a part, e.g. close-up attachment
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
Definitions
- the extender lens of the present invention is detachably arranged inside the master lens for imaging, and the focal length of the entire lens system after insertion is longer than the focal length of the master lens while keeping the imaging position constant.
- An extender lens comprising, in order from the object side, a first lens group having a positive refractive power as a whole and a second lens group having a negative refractive power as a whole.
- a three-lens cemented lens in which three lenses of the positive lens, the negative lens, and the positive lens are cemented in order from the object side, and the following conditional expression (1) is satisfied. It is characterized by that. 26 ⁇ 1n ⁇ 40 (1) However, ⁇ 1n: Abbe number based on d-line of negative lens constituting three-piece cemented lens
- the imaging device of the present invention includes the extender lens of the present invention.
- the above "while keeping the imaging position constant” means substantial.
- an imaging device is configured by arranging an imaging device on the imaging surface of a master lens
- the pixel pitch of this imaging device is p and the F number of the entire lens system in which the extender lens is inserted is AFN
- the allowable change amount of the imaging position before and after the insertion of the extender lens can be in the range of ⁇ 4 ⁇ p ⁇ AFN to + 4 ⁇ p ⁇ AFN.
- the master lens ML illustrated in FIG. 1 is a zoom lens, and in order from the object side, a focus lens group F, a variator lens group V, a compensator lens group C, an aperture St, a relay lens front group RF, It consists of a relay lens rear group RR.
- a relay lens group configured by combining the relay lens front group RF and the relay lens rear group RR has an imaging function.
- the focus lens group F, the relay lens front group RF, and the relay lens rear group RR are fixed with respect to the image plane Sim, and the variator lens group V and the compensator lens group C are in the optical axis direction. It moves so that the mutual space
- the first lens group G1 is composed of one or more positive lenses and a three-piece cemented lens 3CE in order from the object side.
- the three-piece cemented lens 3CE is obtained by cementing three lenses of a positive lens, a negative lens, and a positive lens in order from the object side.
- the first lens group G1 has one or more positive lenses in addition to the positive lenses constituting the three-piece cemented lens 3CE, sufficient positive refractive power can be given to the first lens group G1.
- conditional expression (1) By making it not below the lower limit of conditional expression (1), a material having a small partial dispersion ratio can be selected, and the occurrence of secondary chromatic aberration can be suppressed. By preventing the conditional expression (1) from exceeding the upper limit, the primary chromatic aberration can be corrected satisfactorily. In order to enhance the effect relating to the conditional expression (1), it is preferable that the following conditional expression (1-1) is satisfied. 28 ⁇ 1n ⁇ 35 (1-1)
- conditional expression (6) By avoiding the lower limit of conditional expression (6) from being reached, correction of spherical aberration can be facilitated. By making it not exceed the upper limit of conditional expression (6), a material having an appropriate partial dispersion ratio can be selected, and correction of secondary chromatic aberration is facilitated. In order to enhance the effect regarding the lower limit while obtaining the effect regarding the upper limit of the conditional expression (6), it is preferable to satisfy the following conditional expression (6-1). 1.95 ⁇ N1n ⁇ 2.05 (6-1)
- conditional expression (7) By making it not below the lower limit of conditional expression (7), a material having an appropriate Abbe number can be selected, and correction of primary chromatic aberration is facilitated. By preventing the upper limit of conditional expression (7) from being exceeded, the occurrence of secondary chromatic aberration can be suppressed. In order to enhance the effect of the conditional expression (7), it is preferable that the following conditional expression (7-1) is satisfied. 0.57 ⁇ 1n ⁇ 0.6 (7-1)
- Table 1 shows basic lens data of the master lens ML shown in FIG.
- the object-side surface of the most object-side component is the first, and the surface number of the component surface is assigned so as to increase sequentially toward the image side. 1, 2, 3,...)
- the Ri column indicates the radius of curvature of the i-th surface
- the Di column indicates the optical axis Z between the i-th surface and the i + 1-th surface. Indicates the surface spacing.
- aberrations relating to the d-line are shown as a solid line, a long broken line, Indicated by a short dashed line and a gray solid line.
- the aberration related to the d-line in the sagittal direction is indicated by a solid line
- the aberration related to the d-line in the tangential direction is indicated by a short broken line.
- the aberration regarding the d-line is shown by a solid line.
- Table 4 shows basic lens data of the extender lens EX of Example 1.
- the symbols and description methods used in Table 4 are basically the same as those in Table 1.
- the optical member P and the aperture stop St are different from those in Table 1 in that they are not in Table 4 and in Table 4 the bottom column of Di is blank.
- the extender lens EX is detachably disposed between the 39th and 40th surfaces of the master lens ML shown in Table 1.
- the air spacing from the 40th surface is shown as “air spacing from the 39th surface of the master lens” and “air spacing from the 40th surface of the master lens” respectively below the frame in Table 4.
- Table 8 shows basic lens data of the extender lens EX of Example 3.
- Table 9 shows the specifications of the entire system in which the extender lens EX of Example 3 was inserted between the 39th surface and the 40th surface of Table 1, and FIG. 8 shows a state where the entire system is focused on an infinite object. Each aberration diagram is shown.
- Table 10 shows the corresponding values of the conditional expressions (1) to (8) of the extender lens EX of Examples 1 to 3 above.
- the values shown in Table 10 are based on the d-line except for the corresponding values in conditional expression (7).
- the present invention has been described with reference to the embodiments and examples.
- the present invention is not limited to the above-described embodiments and examples, and various modifications can be made.
- the curvature radius, the surface interval, the refractive index, the Abbe number, the partial dispersion ratio, and the like of each lens are not limited to the values shown in the above numerical examples, and may take other values.
- the master lens to which the present invention can be applied is not limited to the above example, and may be a zoom lens, a varifocal lens, or a fixed focus optical system having another configuration.
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Abstract
[Problem] To provide an extender lens having a low spherical aberration and axial chromatic aberration and in which the degradation in performance of the entire system when inserted is reduced, and an imaging device provided with the extender lens. [Solution] An extender lens (EX) is disposed in a master lens (ML) so as to be insertable/detachable. By being inserted, the extender lens (EX) increases the focal length without changing the image position. The extender lens (EX) comprises a positive first lens group (G1) and a negative second lens group (G2) in sequence from the object side. The first lens group (G1) comprises, in sequence from the object side, one or more positive lenses and a cemented triplet lens (3CE) comprising a positive lens, a negative lens, and a positive lens cemented together in the described sequence from the object side. Conditional relationship (1): 26 < ν1n < 40 relating to the Abbe number ν1n of the negative lens of the cemented triplet lens (3CE) is satisfied.
Description
本発明は、撮像用のマスターレンズの内部に挿入されることにより挿入後のレンズ全系の焦点距離をこのマスターレンズの焦点距離よりも長焦点距離側へ変化させるエクステンダーレンズ、およびこのエクステンダーレンズを備えた撮像装置に関するものである。
The present invention includes an extender lens that is inserted into an imaging master lens to change the focal length of the entire lens system after insertion to a longer focal length side than the focal length of the master lens, and the extender lens. The present invention relates to an imaging apparatus provided.
従来、映画撮影用カメラ等の分野において、撮像用のマスターレンズの内部に挿脱自在に配されて、挿入後のレンズ全系の焦点距離をマスターレンズの焦点距離よりも長焦点距離側へ変化させるエクステンダーレンズが用いられている。例えば、下記特許文献1および2には、4群または5群構成の変倍光学系をマスターレンズとし、このうち変倍の際に固定されている最も像側のレンズ群の内部にエクステンダーレンズを挿入した構成が開示されている。
Conventionally, in the field of movie shooting cameras, etc., it has been detachably placed inside the master lens for imaging, and the focal length of the entire lens system after insertion has been changed to a longer focal length side than the focal length of the master lens Extender lenses are used. For example, in Patent Documents 1 and 2 below, a variable-magnification optical system having a four-group or five-group configuration is used as a master lens, and an extender lens is installed inside the most image-side lens group fixed during zooming. An inserted configuration is disclosed.
近年の画像および映像の分野では高画質化への要求が高まっており、レンズ系にも高性能化が求められている。しかしながら、特許文献1に記載されているエクステンダーレンズは近年の要求レベルに比して、球面収差および軸上色収差が大きく、マスターレンズに挿入された際にレンズ全系の性能劣化が大きい。また、特許文献2に記載されているエクステンダーレンズも、近年の要求レベルに十分応えるためにはマスターレンズに挿入された際のレンズ全系の軸上色収差について改善の余地がある。
In recent years, there has been an increasing demand for higher image quality in the field of images and videos, and higher performance is also required for lens systems. However, the extender lens described in Patent Document 1 has larger spherical aberration and longitudinal chromatic aberration than the recent required level, and the performance of the entire lens system is greatly deteriorated when inserted into the master lens. The extender lens described in Patent Document 2 also has room for improvement in terms of axial chromatic aberration of the entire lens system when it is inserted into a master lens in order to sufficiently meet the recent required level.
本発明は上記事情に鑑みなされたものであり、結像位置を変えずに、マスターレンズの内部に挿入後のレンズ全系の焦点距離をこのマスターレンズの焦点距離よりも長焦点距離側へ変化させる作用を有しながら、球面収差および軸上色収差が小さく、マスターレンズに挿入した際の性能劣化が小さいエクステンダーレンズ、およびこのエクステンダーレンズを備えた撮像装置を提供することを目的とするものである。
The present invention has been made in view of the above circumstances, and without changing the imaging position, the focal length of the entire lens system after being inserted into the master lens is changed to a longer focal length side than the focal length of the master lens. It is an object of the present invention to provide an extender lens having a small spherical aberration and axial chromatic aberration and a small performance deterioration when inserted into a master lens, and an image pickup apparatus including the extender lens. .
本発明のエクステンダーレンズは、撮像用のマスターレンズの内部に挿脱自在に配されて、結像位置を一定に保ったまま挿入後のレンズ全系の焦点距離をマスターレンズの焦点距離よりも長くするエクステンダーレンズであって、物体側から順に、全体として正の屈折力を有する第1レンズ群と、全体として負の屈折力を有する第2レンズ群とからなり、第1レンズ群は、物体側から順に、1枚以上の正レンズと、物体側から順に正レンズ、負レンズ、および正レンズの3枚のレンズが接合された3枚接合レンズとからなり、下記条件式(1)を満足することを特徴とする。
26<ν1n<40 (1)
ただし、
ν1n:3枚接合レンズを構成する負レンズのd線基準のアッベ数 The extender lens of the present invention is detachably arranged inside the master lens for imaging, and the focal length of the entire lens system after insertion is longer than the focal length of the master lens while keeping the imaging position constant. An extender lens comprising, in order from the object side, a first lens group having a positive refractive power as a whole and a second lens group having a negative refractive power as a whole. In order from the object side, and a three-lens cemented lens in which three lenses of the positive lens, the negative lens, and the positive lens are cemented in order from the object side, and the following conditional expression (1) is satisfied. It is characterized by that.
26 <ν1n <40 (1)
However,
ν1n: Abbe number based on d-line of negative lens constituting three-piece cemented lens
26<ν1n<40 (1)
ただし、
ν1n:3枚接合レンズを構成する負レンズのd線基準のアッベ数 The extender lens of the present invention is detachably arranged inside the master lens for imaging, and the focal length of the entire lens system after insertion is longer than the focal length of the master lens while keeping the imaging position constant. An extender lens comprising, in order from the object side, a first lens group having a positive refractive power as a whole and a second lens group having a negative refractive power as a whole. In order from the object side, and a three-lens cemented lens in which three lenses of the positive lens, the negative lens, and the positive lens are cemented in order from the object side, and the following conditional expression (1) is satisfied. It is characterized by that.
26 <ν1n <40 (1)
However,
ν1n: Abbe number based on d-line of negative lens constituting three-piece cemented lens
本発明のエクステンダーレンズにおいては、下記条件式(2)、(3)、(6)~(8)、(1-1)~(3-1)、および(6-1)~(8-1)のうちの少なくとも1つを満足することが好ましい。
25<ν1pa-ν1n<35 (2)
-5<f1/f1n<-2 (3)
1.9<N1n<2.05 (6)
0.55<θ1n<0.605 (7)
0.3<N1n-N1pa<0.5(8)
28<ν1n<35 (1-1)
25<ν1pa-ν1n<32 (2-1)
-3.5<f1/f1n<-2.7 (3-1)
1.95<N1n<2.05 (6-1)
0.57<θ1n<0.6 (7-1)
0.33<N1n-N1pa<0.45(8-1)
ただし、
ν1pa:第1レンズ群を構成する正レンズのd線基準のアッベ数の平均
ν1n:3枚接合レンズを構成する負レンズのd線基準のアッベ数
f1:第1レンズ群の焦点距離
f1n:3枚接合レンズを構成する負レンズの焦点距離
N1n:3枚接合レンズを構成する負レンズのd線に対する屈折率
θ1n:3枚接合レンズを構成する負レンズのg線とF線間の部分分散比
N1pa:第1レンズ群を構成する正レンズのd線に対する屈折率の平均 In the extender lens of the present invention, the following conditional expressions (2), (3), (6) to (8), (1-1) to (3-1), and (6-1) to (8-1) It is preferable that at least one of the above is satisfied.
25 <ν1pa−ν1n <35 (2)
-5 <f1 / f1n <-2 (3)
1.9 <N1n <2.05 (6)
0.55 <θ1n <0.605 (7)
0.3 <N1n-N1pa <0.5 (8)
28 <ν1n <35 (1-1)
25 <ν1pa−ν1n <32 (2-1)
−3.5 <f1 / f1n <−2.7 (3-1)
1.95 <N1n <2.05 (6-1)
0.57 <θ1n <0.6 (7-1)
0.33 <N1n-N1pa <0.45 (8-1)
However,
ν1pa: average dbe reference Abbe number of the positive lens constituting the first lens group ν1n: dbe reference Abbe number of the negative lens constituting the three-piece cemented lens f1: focal length f1n of the first lens group: 3 Focal length N1n of negative lens constituting the cemented lens: Refractive index θ1n with respect to d-line of negative lens constituting the three-piece cemented lens: Partial dispersion ratio between g-line and F-line of the negative lens constituting the three-piece cemented lens N1pa: Average refractive index with respect to d-line of the positive lens constituting the first lens group
25<ν1pa-ν1n<35 (2)
-5<f1/f1n<-2 (3)
1.9<N1n<2.05 (6)
0.55<θ1n<0.605 (7)
0.3<N1n-N1pa<0.5(8)
28<ν1n<35 (1-1)
25<ν1pa-ν1n<32 (2-1)
-3.5<f1/f1n<-2.7 (3-1)
1.95<N1n<2.05 (6-1)
0.57<θ1n<0.6 (7-1)
0.33<N1n-N1pa<0.45(8-1)
ただし、
ν1pa:第1レンズ群を構成する正レンズのd線基準のアッベ数の平均
ν1n:3枚接合レンズを構成する負レンズのd線基準のアッベ数
f1:第1レンズ群の焦点距離
f1n:3枚接合レンズを構成する負レンズの焦点距離
N1n:3枚接合レンズを構成する負レンズのd線に対する屈折率
θ1n:3枚接合レンズを構成する負レンズのg線とF線間の部分分散比
N1pa:第1レンズ群を構成する正レンズのd線に対する屈折率の平均 In the extender lens of the present invention, the following conditional expressions (2), (3), (6) to (8), (1-1) to (3-1), and (6-1) to (8-1) It is preferable that at least one of the above is satisfied.
25 <ν1pa−ν1n <35 (2)
-5 <f1 / f1n <-2 (3)
1.9 <N1n <2.05 (6)
0.55 <θ1n <0.605 (7)
0.3 <N1n-N1pa <0.5 (8)
28 <ν1n <35 (1-1)
25 <ν1pa−ν1n <32 (2-1)
−3.5 <f1 / f1n <−2.7 (3-1)
1.95 <N1n <2.05 (6-1)
0.57 <θ1n <0.6 (7-1)
0.33 <N1n-N1pa <0.45 (8-1)
However,
ν1pa: average dbe reference Abbe number of the positive lens constituting the first lens group ν1n: dbe reference Abbe number of the negative lens constituting the three-piece cemented lens f1: focal length f1n of the first lens group: 3 Focal length N1n of negative lens constituting the cemented lens: Refractive index θ1n with respect to d-line of negative lens constituting the three-piece cemented lens: Partial dispersion ratio between g-line and F-line of the negative lens constituting the three-piece cemented lens N1pa: Average refractive index with respect to d-line of the positive lens constituting the first lens group
また、本発明のエクステンダーレンズにおいては、第2レンズ群は、1枚以上の正レンズと、1枚以上の負レンズとからなることが好ましく、このように構成した場合は、下記条件式(4)、(5)、(4-1)、および(5-1)のうちの少なくとも1つを満足することが好ましい。
1.8<N2a<2.05 (4)
-0.1<N2na-N2pa<0 (5)
1.85<N2a<2.05 (4-1)
-0.06<N2na-N2pa<0 (5-1)
ただし、
N2a:第2レンズ群を構成するレンズのd線に対する屈折率の平均
N2na:第2レンズ群が複数の負レンズを有する場合は第2レンズ群を構成する負レンズのd線に対する屈折率の平均であり、第2レンズ群が1枚のみ負レンズを有する場合はこの負レンズのd線に対する屈折率
N2pa:第2レンズ群が複数の正レンズを有する場合は第2レンズ群を構成する正レンズのd線に対する屈折率の平均であり、第2レンズ群が1枚のみ正レンズを有する場合はこの正レンズのd線に対する屈折率 In the extender lens of the present invention, it is preferable that the second lens group is composed of one or more positive lenses and one or more negative lenses. In such a configuration, the following conditional expression (4 ), (5), (4-1), and (5-1) are preferably satisfied.
1.8 <N2a <2.05 (4)
-0.1 <N2na-N2pa <0 (5)
1.85 <N2a <2.05 (4-1)
-0.06 <N2na-N2pa <0 (5-1)
However,
N2a: Average refractive index with respect to d-line of lenses constituting the second lens group N2na: Average refractive index with respect to d-line of negative lenses constituting the second lens group when the second lens group has a plurality of negative lenses In the case where the second lens group has only one negative lens, the refractive index N2pa for the d-line of this negative lens: if the second lens group has a plurality of positive lenses, the positive lens constituting the second lens group The refractive index of the positive lens with respect to the d-line when the second lens group has only one positive lens.
1.8<N2a<2.05 (4)
-0.1<N2na-N2pa<0 (5)
1.85<N2a<2.05 (4-1)
-0.06<N2na-N2pa<0 (5-1)
ただし、
N2a:第2レンズ群を構成するレンズのd線に対する屈折率の平均
N2na:第2レンズ群が複数の負レンズを有する場合は第2レンズ群を構成する負レンズのd線に対する屈折率の平均であり、第2レンズ群が1枚のみ負レンズを有する場合はこの負レンズのd線に対する屈折率
N2pa:第2レンズ群が複数の正レンズを有する場合は第2レンズ群を構成する正レンズのd線に対する屈折率の平均であり、第2レンズ群が1枚のみ正レンズを有する場合はこの正レンズのd線に対する屈折率 In the extender lens of the present invention, it is preferable that the second lens group is composed of one or more positive lenses and one or more negative lenses. In such a configuration, the following conditional expression (4 ), (5), (4-1), and (5-1) are preferably satisfied.
1.8 <N2a <2.05 (4)
-0.1 <N2na-N2pa <0 (5)
1.85 <N2a <2.05 (4-1)
-0.06 <N2na-N2pa <0 (5-1)
However,
N2a: Average refractive index with respect to d-line of lenses constituting the second lens group N2na: Average refractive index with respect to d-line of negative lenses constituting the second lens group when the second lens group has a plurality of negative lenses In the case where the second lens group has only one negative lens, the refractive index N2pa for the d-line of this negative lens: if the second lens group has a plurality of positive lenses, the positive lens constituting the second lens group The refractive index of the positive lens with respect to the d-line when the second lens group has only one positive lens.
本発明のエクステンダーレンズにおいては、第1レンズ群の3枚接合レンズより物体側に配置される第1レンズ群の正レンズは2枚以下であるように構成してもよい。
The extender lens of the present invention may be configured such that the number of positive lenses in the first lens group disposed on the object side from the three cemented lenses in the first lens group is two or less.
本発明のエクステンダーレンズにおいては、第2レンズ群は2枚のレンズからなるように構成してもよい。このようにした場合は、第2レンズ群は、負レンズおよび正レンズが接合された接合レンズからなるように構成してもよい。
In the extender lens of the present invention, the second lens group may be composed of two lenses. In this case, the second lens group may be constituted by a cemented lens in which a negative lens and a positive lens are cemented.
本発明の撮像装置は、本発明のエクステンダーレンズを備えたものである。
The imaging device of the present invention includes the extender lens of the present invention.
なお、上記の「~からなり」および「~からなる」は、実質的なことを意味するものであり、構成要素として挙げたもの以外に、実質的にパワーを有さないレンズ、絞りおよび/またはカバーガラス等のレンズ以外の光学要素、レンズフランジ、レンズバレル、および/または手振れ補正機構等の機構部分等が含まれていてもよい。
The above-mentioned “consisting of” and “consisting of” mean substantially, and in addition to those listed as constituent elements, a lens, a diaphragm and / or a lens having substantially no power. Alternatively, an optical element other than a lens such as a cover glass, a lens flange, a lens barrel, and / or a mechanism portion such as a camera shake correction mechanism may be included.
なお、上記の「結像位置を一定に保ったまま」は、実質的なことを意味するものである。例えば、マスターレンズの結像面に撮像素子を配置して撮像装置を構成する場合、この撮像素子の画素ピッチをpとし、エクステンダーレンズが挿入されたレンズ全系のFナンバーをAFNとしたとき、エクステンダーレンズの挿入前後の結像位置の許容変化量は、-4×p×AFN~+4×p×AFNの範囲とすることができる。
It should be noted that the above "while keeping the imaging position constant" means substantial. For example, when an imaging device is configured by arranging an imaging device on the imaging surface of a master lens, when the pixel pitch of this imaging device is p and the F number of the entire lens system in which the extender lens is inserted is AFN, The allowable change amount of the imaging position before and after the insertion of the extender lens can be in the range of −4 × p × AFN to + 4 × p × AFN.
なお、上記のレンズ群の屈折力の符号、レンズの屈折力の符号、およびレンズの面形状は、非球面が含まれているものは近軸領域で考えることとする。また、断りがない限り上記条件式は全てd線(波長587.6nm)を基準としたものである。
It should be noted that the sign of the refractive power of the lens group, the sign of the refractive power of the lens, and the surface shape of the lens are considered in the paraxial region if an aspheric surface is included. Unless otherwise noted, all of the above conditional expressions are based on the d-line (wavelength 587.6 nm).
なお、あるレンズのg線とF線間の部分分散比θgFとは、そのレンズのg線(波長435.8nm)、F線(波長486.1nm)、およびC線(波長656.3nm)の屈折率をそれぞれNg、NF、およびNCとしたとき、θgF=(Ng-NF)/(NF-NC)で定義されるものである。
Note that the partial dispersion ratio θgF between the g line and the F line of a lens is the g-line (wavelength 435.8 nm), F line (wavelength 486.1 nm), and C line (wavelength 656.3 nm) of the lens. When the refractive indices are Ng, NF, and NC, respectively, θgF = (Ng−NF) / (NF−NC).
本発明によれば、物体側から順に、正の第1レンズ群と、負の第2レンズ群とからなるエクステンダーレンズにおいて、第1レンズ群が有するレンズの構成を好適に設定し、所定の条件式を満足するように設定しているため、結像位置を変えずに、マスターレンズの内部に挿入後のレンズ全系の焦点距離をこのマスターレンズの焦点距離よりも長焦点距離側へ変化させる作用を有しながら、球面収差および軸上色収差が小さく、マスターレンズに挿入した際の性能劣化が小さいエクステンダーレンズ、およびこのエクステンダーレンズを備えた撮像装置を提供することができる。
According to the present invention, in the extender lens composed of the positive first lens group and the negative second lens group in order from the object side, the lens configuration of the first lens group is suitably set, and a predetermined condition is set. Since it is set to satisfy the equation, the focal length of the entire lens system after being inserted into the master lens is changed to a longer focal length side than the focal length of the master lens without changing the imaging position. It is possible to provide an extender lens that has a small spherical aberration and axial chromatic aberration and has a small performance deterioration when inserted into a master lens, and an image pickup apparatus including the extender lens.
以下、本発明の実施形態について図面を参照して詳細に説明する。本実施形態に係るエクステンダーレンズEXは、撮像用のマスターレンズMLの内部に挿脱自在に配されて、結像位置を一定に保ったまま、挿入後のレンズ全系(マスターレンズMLとエクステンダーレンズEXの合成レンズ系)の焦点距離をマスターレンズMLの焦点距離よりも長くするものである。すなわち、このエクステンダーレンズEXを挿入する前のマスターレンズML単体の結像面の位置と、エクステンダーレンズEXを挿入した後のレンズ全系の結像面Simの位置とは一致しており、エクステンダーレンズEXの挿入により焦点距離が拡大される。
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The extender lens EX according to the present embodiment is detachably arranged inside the imaging master lens ML, and the entire lens system (master lens ML and extender lens after insertion) is maintained while keeping the imaging position constant. The focal length of the EX synthetic lens system is made longer than the focal length of the master lens ML. That is, the position of the imaging surface of the single master lens ML before the insertion of the extender lens EX coincides with the position of the imaging surface Sim of the entire lens system after the insertion of the extender lens EX. The focal length is expanded by inserting EX.
マスターレンズMLとしては、例えば、映画撮影用カメラ、放送用カメラ、ビデオカメラ、デジタルカメラ、および/または監視用カメラ等の撮像装置に搭載可能な撮像レンズを挙げることができる。
Examples of the master lens ML include an imaging lens that can be mounted on an imaging apparatus such as a movie shooting camera, a broadcast camera, a video camera, a digital camera, and / or a surveillance camera.
図1は、本発明の一実施形態に係るエクステンダーレンズEXをマスターレンズMLの内部に挿入した状態の構成を示す断面図である。図2は、図1のエクステンダーレンズEXの構成を示す断面図である。図2に示す例のエクステンダーレンズEXは後述の実施例1に対応している。図1および図2では、図の左側が物体側、右側が像側である。
FIG. 1 is a cross-sectional view showing a configuration in a state where an extender lens EX according to an embodiment of the present invention is inserted into a master lens ML. FIG. 2 is a cross-sectional view showing the configuration of the extender lens EX of FIG. The extender lens EX of the example shown in FIG. 2 corresponds to Example 1 described later. 1 and 2, the left side of the figure is the object side, and the right side is the image side.
図1に例示するマスターレンズMLは、ズームレンズであり、物体側から順に、フォーカスレンズ群Fと、バリエーターレンズ群Vと、コンペンセーターレンズ群Cと、絞りStと、リレーレンズ前群RFと、リレーレンズ後群RRとからなる。リレーレンズ前群RFとリレーレンズ後群RRを合成して構成されるリレーレンズ群は結像作用を有する。変倍の際に、フォーカスレンズ群F、リレーレンズ前群RF、およびリレーレンズ後群RRは結像面Simに対して固定されており、バリエーターレンズ群Vおよびコンペンセーターレンズ群Cは光軸方向の相互間隔を変化させて移動するように構成されている。
The master lens ML illustrated in FIG. 1 is a zoom lens, and in order from the object side, a focus lens group F, a variator lens group V, a compensator lens group C, an aperture St, a relay lens front group RF, It consists of a relay lens rear group RR. A relay lens group configured by combining the relay lens front group RF and the relay lens rear group RR has an imaging function. At the time of zooming, the focus lens group F, the relay lens front group RF, and the relay lens rear group RR are fixed with respect to the image plane Sim, and the variator lens group V and the compensator lens group C are in the optical axis direction. It moves so that the mutual space | interval may be changed.
図1の例のリレーレンズ前群RFとリレーレンズ後群RRは所定の空気間隔を隔てて配置されている。無限遠物体に合焦したマスターレンズML単体の状態では、リレーレンズ前群RFとリレーレンズ後群RRの空間には略平行光が通るように構成されている。エクステンダーレンズEXをこのようなリレーレンズ前群RFとリレーレンズ後群RRの間に挿脱自在に配することで、結像位置を一定に保ったまま、エクステンダーレンズEXの挿入により焦点距離を拡大することが容易となる。
In the example of FIG. 1, the relay lens front group RF and the relay lens rear group RR are arranged with a predetermined air space therebetween. In the state of the master lens ML alone focused on an object at infinity, it is configured such that substantially parallel light passes through the space between the relay lens front group RF and the relay lens rear group RR. The extender lens EX is detachably disposed between the relay lens front group RF and the relay lens rear group RR so that the focal length can be expanded by inserting the extender lens EX while keeping the image forming position constant. Easy to do.
なお、レンズ系を撮像装置に適用する際には、撮像装置の仕様に応じた各種フィルタ、プリズム、および/または保護用のカバーガラスを備えることが好ましい。このため図1では、これらを想定した入射面と出射面が光軸Zに垂直な光学部材Pをレンズ系と結像面Simとの間に配置した例を示している。しかし、光学部材Pは本発明においては省略可能である。
In addition, when applying a lens system to an imaging device, it is preferable to provide various filters, prisms, and / or protective cover glasses according to the specifications of the imaging device. For this reason, FIG. 1 shows an example in which an optical member P having an entrance surface and an exit surface that are perpendicular to the optical axis Z is arranged between the lens system and the imaging surface Sim. However, the optical member P can be omitted in the present invention.
このエクステンダーレンズEXは、光軸Zに沿って物体側から像側へ向かって順に、全体として正の屈折力を有する第1レンズ群G1と、全体として負の屈折力を有する第2レンズ群G2とからなる。このように構成することで、エクステンダーレンズEXの挿入前後で結像位置を変化させることなく、エクステンダーレンズEXに長焦点距離化の作用を持たせることが容易となる。
The extender lens EX includes, in order from the object side to the image side along the optical axis Z, a first lens group G1 having a positive refractive power as a whole, and a second lens group G2 having a negative refractive power as a whole. It consists of. With this configuration, it becomes easy to give the extender lens EX an effect of increasing the focal length without changing the imaging position before and after the insertion of the extender lens EX.
図2に示す例では、第1レンズ群G1は、物体側から順に、正のレンズL11、正のレンズL12、正のレンズL13、負のレンズL14、および正のレンズL15が配置された5枚構成であり、第2レンズ群G2は、物体側から順に、負のレンズL21、および正のレンズL22が配置された2枚構成である。ただし、本発明においては、第1レンズ群G1のレンズ枚数、第2レンズ群G2のレンズ枚数、および/または第2レンズ群G2の負正レンズの配列順は、図2に示す例と異なる構成を採ることも可能である。
In the example shown in FIG. 2, the first lens group G1 includes five lenses in which a positive lens L11, a positive lens L12, a positive lens L13, a negative lens L14, and a positive lens L15 are arranged in order from the object side. The second lens group G2 has a two-lens configuration in which a negative lens L21 and a positive lens L22 are arranged in order from the object side. However, in the present invention, the number of lenses of the first lens group G1, the number of lenses of the second lens group G2, and / or the arrangement order of the negative positive lenses of the second lens group G2 are different from the example shown in FIG. It is also possible to adopt.
第1レンズ群G1は、物体側から順に、1枚以上の正レンズと、3枚接合レンズ3CEとからなる。この3枚接合レンズ3CEは、物体側から順に、正レンズ、負レンズ、および正レンズの3枚のレンズが接合されたものである。第1レンズ群G1が3枚接合レンズ3CEを構成する正レンズ以外に1枚以上の正レンズを有することで、第1レンズ群G1に十分な正の屈折力を与えることができる。
The first lens group G1 is composed of one or more positive lenses and a three-piece cemented lens 3CE in order from the object side. The three-piece cemented lens 3CE is obtained by cementing three lenses of a positive lens, a negative lens, and a positive lens in order from the object side. When the first lens group G1 has one or more positive lenses in addition to the positive lenses constituting the three-piece cemented lens 3CE, sufficient positive refractive power can be given to the first lens group G1.
第1レンズ群G1の3枚接合レンズ3CEより物体側に配置される第1レンズ群G1の正レンズは2枚以下であることが好ましい。すなわち、第1レンズ群G1は、物体側から順に、1枚または2枚の正レンズと、上記の3枚接合レンズ3CEとからなるように構成することが好ましい。このようにした場合は、エクステンダーレンズEXの光軸方向の長さが長くなりすぎるのを防ぐことができる。エクステンダーレンズEXはマスターレンズMLの内部に配置されることから光軸方向の長さに制約があるため、レンズ枚数をこの範囲に限定することが好ましい。
It is preferable that the number of positive lenses in the first lens group G1 disposed on the object side from the three-piece cemented lens 3CE in the first lens group G1 is two or less. That is, it is preferable that the first lens group G1 is configured to include one or two positive lenses and the above-described three-piece cemented lens 3CE in order from the object side. In this case, the length of the extender lens EX in the optical axis direction can be prevented from becoming too long. Since the extender lens EX is disposed inside the master lens ML, the length in the optical axis direction is limited, and therefore, it is preferable to limit the number of lenses within this range.
3枚接合レンズ3CEにおいては、物体側から順に正負正が接合された接合レンズとすることで、物体側から順に正負が接合された2枚接合レンズと比べて、接合レンズ内の負レンズの像側の面となる接合面の曲率半径の絶対値を小さくすることができ、負レンズより物体側の正レンズで発生した球面収差を良好に補正できる。また、2つの接合面のうち少なくとも一方の接合面の物体側と像側のレンズのアッベ数差を小さくしても1次色収差を補正できるため、これらのレンズの材料として部分分散比が近い材料を選択でき、2次色収差の発生を抑えながら1次色収差を補正できる。第1レンズ群G1の正レンズで発生した球面収差および軸上色収差を第1レンズ群G1内で補正することで、球面収差および軸上色収差に加え倍率色収差も同時に補正することができるため、第1レンズ群G1内に3枚接合レンズ3CEを配置することが有利である。仮に、第1レンズ群G1の正レンズで発生した球面収差および軸上色収差を第1レンズ群G1から離れたところで補正しようとすると、軸上と軸外での補正作用が異なってしまうため上記と同等の効果を得ることは難しい。
In the triplet cemented lens 3CE, a positive and negative positive lens is sequentially cemented from the object side, so that an image of a negative lens in the cemented lens is compared with a two-lens cemented lens in which positive and negative are sequentially cemented from the object side. The absolute value of the radius of curvature of the cemented surface, which is the side surface, can be reduced, and spherical aberration generated in the positive lens on the object side from the negative lens can be favorably corrected. Further, since the primary chromatic aberration can be corrected even if the Abbe number difference between the object-side and image-side lenses of at least one of the two cemented surfaces is reduced, a material having a close partial dispersion ratio as a material of these lenses. The primary chromatic aberration can be corrected while suppressing the occurrence of secondary chromatic aberration. By correcting spherical aberration and axial chromatic aberration generated in the positive lens of the first lens group G1 in the first lens group G1, in addition to spherical aberration and axial chromatic aberration, lateral chromatic aberration can be corrected simultaneously. It is advantageous to arrange a three-piece cemented lens 3CE in one lens group G1. If the spherical aberration and axial chromatic aberration generated in the positive lens of the first lens group G1 are to be corrected away from the first lens group G1, the correction action on the axis and off-axis will be different, so that It is difficult to obtain the same effect.
第2レンズ群G2は、1枚以上の負レンズと、1枚以上の正レンズとからなることが好ましい。このように構成することで、諸収差を補正しつつ、第1レンズ群G1で収束させた光束を平行に戻すことができる。エクステンダーレンズEXが上述したようなリレーレンズ群内の略平行光の光路中に挿入される場合は、このような構成が有利である。
The second lens group G2 is preferably composed of one or more negative lenses and one or more positive lenses. With this configuration, it is possible to return the light beam converged by the first lens group G1 to be parallel while correcting various aberrations. Such an arrangement is advantageous when the extender lens EX is inserted into the optical path of substantially parallel light in the relay lens group as described above.
第2レンズ群G2は2枚のレンズからなるように構成してもよい。このように構成することで、エクステンダーレンズEXの光軸方向の長さが長くなりすぎるのを防ぐことができる。このようにした場合、第2レンズ群G2は、1枚の負レンズと1枚の正レンズとからなるように構成してもよい。さらに、第2レンズ群G2は、負レンズおよび正レンズが接合された接合レンズからなるように構成してもよく、このようにした場合は、負レンズと正レンズそれぞれの屈折力を強めながら5次以上の高次の球面収差の発生を抑えることができる。
The second lens group G2 may be configured to include two lenses. With this configuration, the extender lens EX can be prevented from becoming too long in the optical axis direction. In this case, the second lens group G2 may be configured to include one negative lens and one positive lens. Further, the second lens group G2 may be configured to include a cemented lens in which a negative lens and a positive lens are cemented. In this case, the second lens group G2 is configured to increase the refractive power of each of the negative lens and the positive lens. It is possible to suppress the occurrence of higher-order spherical aberration than the next order.
このエクステンダーレンズEXは下記条件式(1)を満足するように構成される。
26<ν1n<40 (1)
ただし、
ν1n:3枚接合レンズを構成する負レンズのd線基準のアッベ数 The extender lens EX is configured to satisfy the following conditional expression (1).
26 <ν1n <40 (1)
However,
ν1n: Abbe number based on d-line of negative lens constituting three-piece cemented lens
26<ν1n<40 (1)
ただし、
ν1n:3枚接合レンズを構成する負レンズのd線基準のアッベ数 The extender lens EX is configured to satisfy the following conditional expression (1).
26 <ν1n <40 (1)
However,
ν1n: Abbe number based on d-line of negative lens constituting three-piece cemented lens
条件式(1)の下限以下とならないようにすることで、部分分散比の小さい材料を選択することができ、2次色収差の発生を抑えることができる。条件式(1)の上限以上とならないようにすることで、1次色収差を良好に補正できる。条件式(1)に関する効果を高めるためには、下記条件式(1-1)を満足することが好ましい。
28<ν1n<35 (1-1) By making it not below the lower limit of conditional expression (1), a material having a small partial dispersion ratio can be selected, and the occurrence of secondary chromatic aberration can be suppressed. By preventing the conditional expression (1) from exceeding the upper limit, the primary chromatic aberration can be corrected satisfactorily. In order to enhance the effect relating to the conditional expression (1), it is preferable that the following conditional expression (1-1) is satisfied.
28 <ν1n <35 (1-1)
28<ν1n<35 (1-1) By making it not below the lower limit of conditional expression (1), a material having a small partial dispersion ratio can be selected, and the occurrence of secondary chromatic aberration can be suppressed. By preventing the conditional expression (1) from exceeding the upper limit, the primary chromatic aberration can be corrected satisfactorily. In order to enhance the effect relating to the conditional expression (1), it is preferable that the following conditional expression (1-1) is satisfied.
28 <ν1n <35 (1-1)
さらに、下記条件式(2)を満足することが好ましい。
25<ν1pa-ν1n<35 (2)
ただし、
ν1pa:第1レンズ群を構成する正レンズのd線基準のアッベ数の平均
ν1n:3枚接合レンズを構成する負レンズのd線基準のアッベ数 Furthermore, it is preferable that the following conditional expression (2) is satisfied.
25 <ν1pa−ν1n <35 (2)
However,
ν1pa: Average d-line reference Abbe number of the positive lens constituting the first lens group ν1n: d-line reference Abbe number of the negative lens constituting the three-piece cemented lens
25<ν1pa-ν1n<35 (2)
ただし、
ν1pa:第1レンズ群を構成する正レンズのd線基準のアッベ数の平均
ν1n:3枚接合レンズを構成する負レンズのd線基準のアッベ数 Furthermore, it is preferable that the following conditional expression (2) is satisfied.
25 <ν1pa−ν1n <35 (2)
However,
ν1pa: Average d-line reference Abbe number of the positive lens constituting the first lens group ν1n: d-line reference Abbe number of the negative lens constituting the three-piece cemented lens
条件式(2)の下限以下とならないようにすることで、1次色収差を良好に補正できる。条件式(2)の上限以上とならないようにすることで、第1レンズ群G1の正レンズと第1レンズ群G1の負レンズに部分分散比の近い材料を選択でき、2次色収差の発生を抑えることができる。条件式(2)の下限に関する効果を得ながら上限に関する効果を高めるためには、下記条件式(2-1)を満足することが好ましい。
25<ν1pa-ν1n<32 (2-1) By avoiding the lower limit of conditional expression (2) from being reached, the primary chromatic aberration can be corrected satisfactorily. By making sure that the upper limit of conditional expression (2) is not exceeded, a material having a partial dispersion ratio can be selected for the positive lens of the first lens group G1 and the negative lens of the first lens group G1, thereby generating secondary chromatic aberration. Can be suppressed. In order to enhance the effect regarding the upper limit while obtaining the effect regarding the lower limit of the conditional expression (2), it is preferable to satisfy the following conditional expression (2-1).
25 <ν1pa−ν1n <32 (2-1)
25<ν1pa-ν1n<32 (2-1) By avoiding the lower limit of conditional expression (2) from being reached, the primary chromatic aberration can be corrected satisfactorily. By making sure that the upper limit of conditional expression (2) is not exceeded, a material having a partial dispersion ratio can be selected for the positive lens of the first lens group G1 and the negative lens of the first lens group G1, thereby generating secondary chromatic aberration. Can be suppressed. In order to enhance the effect regarding the upper limit while obtaining the effect regarding the lower limit of the conditional expression (2), it is preferable to satisfy the following conditional expression (2-1).
25 <ν1pa−ν1n <32 (2-1)
また、下記条件式(3)を満足することが好ましい。
-5<f1/f1n<-2 (3)
ただし、
f1:第1レンズ群の焦点距離
f1n:3枚接合レンズを構成する負レンズの焦点距離 Moreover, it is preferable that the following conditional expression (3) is satisfied.
-5 <f1 / f1n <-2 (3)
However,
f1: Focal length of the first lens group f1n: Focal length of the negative lens constituting the three-piece cemented lens
-5<f1/f1n<-2 (3)
ただし、
f1:第1レンズ群の焦点距離
f1n:3枚接合レンズを構成する負レンズの焦点距離 Moreover, it is preferable that the following conditional expression (3) is satisfied.
-5 <f1 / f1n <-2 (3)
However,
f1: Focal length of the first lens group f1n: Focal length of the negative lens constituting the three-piece cemented lens
第1レンズ群G1の屈折力に対する第1レンズ群G1の負レンズの屈折力の比を条件式(3)の範囲に収めることで、第1レンズ群G1の正レンズで発生した球面収差の補正を容易にすることができる。条件式(3)に関する効果を高めるためには、下記条件式(3-1)を満足することが好ましい。
-3.5<f1/f1n<-2.7 (3-1) Correction of spherical aberration generated in the positive lens of the first lens group G1 by keeping the ratio of the refractive power of the negative lens of the first lens group G1 to the refractive power of the first lens group G1 within the range of the conditional expression (3). Can be made easier. In order to enhance the effect relating to the conditional expression (3), it is preferable that the following conditional expression (3-1) is satisfied.
−3.5 <f1 / f1n <−2.7 (3-1)
-3.5<f1/f1n<-2.7 (3-1) Correction of spherical aberration generated in the positive lens of the first lens group G1 by keeping the ratio of the refractive power of the negative lens of the first lens group G1 to the refractive power of the first lens group G1 within the range of the conditional expression (3). Can be made easier. In order to enhance the effect relating to the conditional expression (3), it is preferable that the following conditional expression (3-1) is satisfied.
−3.5 <f1 / f1n <−2.7 (3-1)
第2レンズ群G2が、1枚以上の正レンズと、1枚以上の負レンズとからなる場合、下記条件式(4)を満足することが好ましい。
1.8<N2a<2.05 (4)
ただし、
N2a:第2レンズ群を構成するレンズのd線に対する屈折率の平均 When the second lens group G2 includes one or more positive lenses and one or more negative lenses, it is preferable that the following conditional expression (4) is satisfied.
1.8 <N2a <2.05 (4)
However,
N2a: Average refractive index with respect to d-line of lenses constituting the second lens group
1.8<N2a<2.05 (4)
ただし、
N2a:第2レンズ群を構成するレンズのd線に対する屈折率の平均 When the second lens group G2 includes one or more positive lenses and one or more negative lenses, it is preferable that the following conditional expression (4) is satisfied.
1.8 <N2a <2.05 (4)
However,
N2a: Average refractive index with respect to d-line of lenses constituting the second lens group
条件式(4)の下限以下とならないようにすることで、エクステンダーレンズEXの光軸方向の長さを抑えながら第1レンズ群G1で発生する諸収差、特に球面収差および非点収差を抑えることができる。条件式(4)の上限以上とならないようにすることで、正レンズのアッベ数と負レンズのアッベ数との差を確保できるように適切な材料を選択することが容易となり、色収差の補正に有利となる。条件式(4)の上限に関する効果を得ながら下限に関する効果を高めるためには、下記条件式(4-1)を満足することが好ましい。
1.85<N2a<2.05 (4-1) By avoiding being less than or equal to the lower limit of conditional expression (4), various aberrations, particularly spherical aberration and astigmatism, that occur in the first lens group G1 are suppressed while suppressing the length of the extender lens EX in the optical axis direction. Can do. By making sure that the upper limit of conditional expression (4) is not exceeded, it becomes easy to select an appropriate material so as to ensure the difference between the Abbe number of the positive lens and the Abbe number of the negative lens, and for correcting chromatic aberration. It will be advantageous. In order to enhance the effect regarding the lower limit while obtaining the effect regarding the upper limit of the conditional expression (4), it is preferable to satisfy the following conditional expression (4-1).
1.85 <N2a <2.05 (4-1)
1.85<N2a<2.05 (4-1) By avoiding being less than or equal to the lower limit of conditional expression (4), various aberrations, particularly spherical aberration and astigmatism, that occur in the first lens group G1 are suppressed while suppressing the length of the extender lens EX in the optical axis direction. Can do. By making sure that the upper limit of conditional expression (4) is not exceeded, it becomes easy to select an appropriate material so as to ensure the difference between the Abbe number of the positive lens and the Abbe number of the negative lens, and for correcting chromatic aberration. It will be advantageous. In order to enhance the effect regarding the lower limit while obtaining the effect regarding the upper limit of the conditional expression (4), it is preferable to satisfy the following conditional expression (4-1).
1.85 <N2a <2.05 (4-1)
また、第2レンズ群G2が、1枚以上の正レンズと、1枚以上の負レンズとからなる場合、下記条件式(5)を満足することが好ましい。
-0.1<N2na-N2pa<0 (5)
ただし、
N2na:第2レンズ群が複数の負レンズを有する場合は第2レンズ群を構成する負レンズのd線に対する屈折率の平均であり、第2レンズ群が1枚のみ負レンズを有する場合はこの負レンズのd線に対する屈折率
N2pa:第2レンズ群が複数の正レンズを有する場合は第2レンズ群を構成する正レンズのd線に対する屈折率の平均であり、第2レンズ群が1枚のみ正レンズを有する場合はこの正レンズのd線に対する屈折率 Further, when the second lens group G2 includes one or more positive lenses and one or more negative lenses, it is preferable that the following conditional expression (5) is satisfied.
-0.1 <N2na-N2pa <0 (5)
However,
N2na: When the second lens group has a plurality of negative lenses, this is the average refractive index with respect to the d-line of the negative lens constituting the second lens group, and when the second lens group has only one negative lens, this Refractive index N2pa for the d-line of the negative lens: When the second lens group has a plurality of positive lenses, it is the average refractive index for the d-line of the positive lens constituting the second lens group, and one second lens group In the case of having only a positive lens, the refractive index of this positive lens with respect to d-line
-0.1<N2na-N2pa<0 (5)
ただし、
N2na:第2レンズ群が複数の負レンズを有する場合は第2レンズ群を構成する負レンズのd線に対する屈折率の平均であり、第2レンズ群が1枚のみ負レンズを有する場合はこの負レンズのd線に対する屈折率
N2pa:第2レンズ群が複数の正レンズを有する場合は第2レンズ群を構成する正レンズのd線に対する屈折率の平均であり、第2レンズ群が1枚のみ正レンズを有する場合はこの正レンズのd線に対する屈折率 Further, when the second lens group G2 includes one or more positive lenses and one or more negative lenses, it is preferable that the following conditional expression (5) is satisfied.
-0.1 <N2na-N2pa <0 (5)
However,
N2na: When the second lens group has a plurality of negative lenses, this is the average refractive index with respect to the d-line of the negative lens constituting the second lens group, and when the second lens group has only one negative lens, this Refractive index N2pa for the d-line of the negative lens: When the second lens group has a plurality of positive lenses, it is the average refractive index for the d-line of the positive lens constituting the second lens group, and one second lens group In the case of having only a positive lens, the refractive index of this positive lens with respect to d-line
条件式(5)の下限以下とならないようにすることで、像面湾曲の発生を抑えることができる。条件式(5)の上限以上とならないようにすることで、球面収差の補正を容易にすることができる。条件式(5)の上限に関する効果を得ながら下限に関する効果を高めるためには、下記条件式(5-1)を満足することが好ましい。
-0.06<N2na-N2pa<0 (5-1) The occurrence of curvature of field can be suppressed by preventing the conditional expression (5) from being below the lower limit of the conditional expression (5). By avoiding the upper limit of conditional expression (5) from being exceeded, correction of spherical aberration can be facilitated. In order to enhance the effect regarding the lower limit while obtaining the effect regarding the upper limit of the conditional expression (5), it is preferable to satisfy the following conditional expression (5-1).
-0.06 <N2na-N2pa <0 (5-1)
-0.06<N2na-N2pa<0 (5-1) The occurrence of curvature of field can be suppressed by preventing the conditional expression (5) from being below the lower limit of the conditional expression (5). By avoiding the upper limit of conditional expression (5) from being exceeded, correction of spherical aberration can be facilitated. In order to enhance the effect regarding the lower limit while obtaining the effect regarding the upper limit of the conditional expression (5), it is preferable to satisfy the following conditional expression (5-1).
-0.06 <N2na-N2pa <0 (5-1)
また、下記条件式(6)を満足することが好ましい。
1.9<N1n<2.05 (6)
ただし、
N1n:3枚接合レンズを構成する負レンズのd線に対する屈折率 Moreover, it is preferable that the following conditional expression (6) is satisfied.
1.9 <N1n <2.05 (6)
However,
N1n: Refractive index with respect to d-line of the negative lens constituting the three-piece cemented lens
1.9<N1n<2.05 (6)
ただし、
N1n:3枚接合レンズを構成する負レンズのd線に対する屈折率 Moreover, it is preferable that the following conditional expression (6) is satisfied.
1.9 <N1n <2.05 (6)
However,
N1n: Refractive index with respect to d-line of the negative lens constituting the three-piece cemented lens
条件式(6)の下限以下とならないようにすることで、球面収差の補正を容易にすることができる。条件式(6)の上限以上とならないようにすることで、適切な部分分散比を有する材料を選択することができ、2次色収差の補正が容易となる。条件式(6)の上限に関する効果を得ながら下限に関する効果を高めるためには、下記条件式(6-1)を満足することが好ましい。
1.95<N1n<2.05 (6-1) By avoiding the lower limit of conditional expression (6) from being reached, correction of spherical aberration can be facilitated. By making it not exceed the upper limit of conditional expression (6), a material having an appropriate partial dispersion ratio can be selected, and correction of secondary chromatic aberration is facilitated. In order to enhance the effect regarding the lower limit while obtaining the effect regarding the upper limit of the conditional expression (6), it is preferable to satisfy the following conditional expression (6-1).
1.95 <N1n <2.05 (6-1)
1.95<N1n<2.05 (6-1) By avoiding the lower limit of conditional expression (6) from being reached, correction of spherical aberration can be facilitated. By making it not exceed the upper limit of conditional expression (6), a material having an appropriate partial dispersion ratio can be selected, and correction of secondary chromatic aberration is facilitated. In order to enhance the effect regarding the lower limit while obtaining the effect regarding the upper limit of the conditional expression (6), it is preferable to satisfy the following conditional expression (6-1).
1.95 <N1n <2.05 (6-1)
また、下記条件式(7)を満足することが好ましい。
0.55<θ1n<0.605 (7)
ただし、
θ1n:3枚接合レンズを構成する負レンズのg線とF線間の部分分散比 Moreover, it is preferable that the following conditional expression (7) is satisfied.
0.55 <θ1n <0.605 (7)
However,
θ1n: partial dispersion ratio between g-line and F-line of the negative lens constituting the three-piece cemented lens
0.55<θ1n<0.605 (7)
ただし、
θ1n:3枚接合レンズを構成する負レンズのg線とF線間の部分分散比 Moreover, it is preferable that the following conditional expression (7) is satisfied.
0.55 <θ1n <0.605 (7)
However,
θ1n: partial dispersion ratio between g-line and F-line of the negative lens constituting the three-piece cemented lens
条件式(7)の下限以下とならないようにすることで、適切なアッベ数の材料を選択することができ、1次色収差の補正が容易となる。条件式(7)の上限以上とならないようにすることで、2次色収差の発生を抑えることができる。条件式(7)に関する効果を高めるためには、下記条件式(7-1)を満足することが好ましい。
0.57<θ1n<0.6 (7-1) By making it not below the lower limit of conditional expression (7), a material having an appropriate Abbe number can be selected, and correction of primary chromatic aberration is facilitated. By preventing the upper limit of conditional expression (7) from being exceeded, the occurrence of secondary chromatic aberration can be suppressed. In order to enhance the effect of the conditional expression (7), it is preferable that the following conditional expression (7-1) is satisfied.
0.57 <θ1n <0.6 (7-1)
0.57<θ1n<0.6 (7-1) By making it not below the lower limit of conditional expression (7), a material having an appropriate Abbe number can be selected, and correction of primary chromatic aberration is facilitated. By preventing the upper limit of conditional expression (7) from being exceeded, the occurrence of secondary chromatic aberration can be suppressed. In order to enhance the effect of the conditional expression (7), it is preferable that the following conditional expression (7-1) is satisfied.
0.57 <θ1n <0.6 (7-1)
また、下記条件式(8)を満足することが好ましい。
0.3<N1n-N1pa<0.5(8)
ただし、
N1n:3枚接合レンズを構成する負レンズのd線に対する屈折率
N1pa:第1レンズ群を構成する正レンズのd線に対する屈折率の平均 Moreover, it is preferable that the following conditional expression (8) is satisfied.
0.3 <N1n-N1pa <0.5 (8)
However,
N1n: Refractive index with respect to d-line of negative lens constituting three-piece cemented lens N1pa: Average refractive index with respect to d-line of positive lens constituting first lens group
0.3<N1n-N1pa<0.5(8)
ただし、
N1n:3枚接合レンズを構成する負レンズのd線に対する屈折率
N1pa:第1レンズ群を構成する正レンズのd線に対する屈折率の平均 Moreover, it is preferable that the following conditional expression (8) is satisfied.
0.3 <N1n-N1pa <0.5 (8)
However,
N1n: Refractive index with respect to d-line of negative lens constituting three-piece cemented lens N1pa: Average refractive index with respect to d-line of positive lens constituting first lens group
条件式(8)の下限以下とならないようにすることで、像面湾曲の補正が容易となる。条件式(8)の上限以上とならないようにすることで、3枚接合レンズ3CE内の負レンズの屈折率が高くなりすぎないようにすることができ、3枚接合レンズ3CE内の接合面の曲率半径の絶対値が大きくなりすぎるのを防ぐことができるため、球面収差の補正が容易となる。条件式(8)に関する効果を高めるためには、下記条件式(8-1)を満足することが好ましい。
0.33<N1n-N1pa<0.45(8-1) By avoiding the lower limit of conditional expression (8) from being reached, correction of field curvature is facilitated. By avoiding exceeding the upper limit of conditional expression (8), the refractive index of the negative lens in the three-piece cemented lens 3CE can be prevented from becoming too high, and the cemented surface in the three-piece cemented lens 3CE can be prevented. Since it is possible to prevent the absolute value of the radius of curvature from becoming too large, it becomes easy to correct spherical aberration. In order to enhance the effect of the conditional expression (8), it is preferable that the following conditional expression (8-1) is satisfied.
0.33 <N1n-N1pa <0.45 (8-1)
0.33<N1n-N1pa<0.45(8-1) By avoiding the lower limit of conditional expression (8) from being reached, correction of field curvature is facilitated. By avoiding exceeding the upper limit of conditional expression (8), the refractive index of the negative lens in the three-piece cemented lens 3CE can be prevented from becoming too high, and the cemented surface in the three-piece cemented lens 3CE can be prevented. Since it is possible to prevent the absolute value of the radius of curvature from becoming too large, it becomes easy to correct spherical aberration. In order to enhance the effect of the conditional expression (8), it is preferable that the following conditional expression (8-1) is satisfied.
0.33 <N1n-N1pa <0.45 (8-1)
なお、上述した好ましい構成および/または可能な構成は、任意の組合せが可能であり、要求される仕様に応じて適宜選択的に採用されることが好ましい。
It should be noted that the preferred configurations and / or possible configurations described above can be arbitrarily combined, and are preferably selectively adopted according to the required specifications.
次に、マスターレンズMLの数値例および本発明のエクステンダーレンズEXの数値実施例について説明する。
Next, numerical examples of the master lens ML and numerical examples of the extender lens EX of the present invention will be described.
[マスターレンズ]
表1に、図1のマスターレンズMLの基本レンズデータを示す。表1のSiの欄には最も物体側の構成要素の物体側の面を1番目として像側に向かうに従い順次増加するように構成要素の面に面番号を付した場合のi番目(i=1、2、3、…)の面番号を示し、Riの欄にはi番目の面の曲率半径を示し、Diの欄にはi番目の面とi+1番目の面との光軸Z上の面間隔を示す。表1のNdjの欄には最も物体側の構成要素を1番目として像側に向かうに従い順次増加するj番目(j=1、2、3、…)の構成要素のd線(波長587.6nm)に関する屈折率を示し、νdjの欄にはj番目の構成要素のd線基準のアッベ数を示し、θgFjの欄はj番目の構成要素のg線(波長435.8nm)とF線(波長486.1nm)間の部分分散比を示す。 [Master lens]
Table 1 shows basic lens data of the master lens ML shown in FIG. In the column of Si in Table 1, the object-side surface of the most object-side component is the first, and the surface number of the component surface is assigned so as to increase sequentially toward the image side. 1, 2, 3,...), The Ri column indicates the radius of curvature of the i-th surface, and the Di column indicates the optical axis Z between the i-th surface and the i + 1-th surface. Indicates the surface spacing. In the column of Ndj in Table 1, the d-line (wavelength 587.6 nm) of the j-th (j = 1, 2, 3,...) Component that increases sequentially toward the image side with the most object-side component as the first. ), The νdj column indicates the d-line reference Abbe number of the jth component, and the θgFj column indicates the gth (wavelength 435.8 nm) and Fline (wavelength) of the jth component. 486.1 nm) is shown.
表1に、図1のマスターレンズMLの基本レンズデータを示す。表1のSiの欄には最も物体側の構成要素の物体側の面を1番目として像側に向かうに従い順次増加するように構成要素の面に面番号を付した場合のi番目(i=1、2、3、…)の面番号を示し、Riの欄にはi番目の面の曲率半径を示し、Diの欄にはi番目の面とi+1番目の面との光軸Z上の面間隔を示す。表1のNdjの欄には最も物体側の構成要素を1番目として像側に向かうに従い順次増加するj番目(j=1、2、3、…)の構成要素のd線(波長587.6nm)に関する屈折率を示し、νdjの欄にはj番目の構成要素のd線基準のアッベ数を示し、θgFjの欄はj番目の構成要素のg線(波長435.8nm)とF線(波長486.1nm)間の部分分散比を示す。 [Master lens]
Table 1 shows basic lens data of the master lens ML shown in FIG. In the column of Si in Table 1, the object-side surface of the most object-side component is the first, and the surface number of the component surface is assigned so as to increase sequentially toward the image side. 1, 2, 3,...), The Ri column indicates the radius of curvature of the i-th surface, and the Di column indicates the optical axis Z between the i-th surface and the i + 1-th surface. Indicates the surface spacing. In the column of Ndj in Table 1, the d-line (wavelength 587.6 nm) of the j-th (j = 1, 2, 3,...) Component that increases sequentially toward the image side with the most object-side component as the first. ), The νdj column indicates the d-line reference Abbe number of the jth component, and the θgFj column indicates the gth (wavelength 435.8 nm) and Fline (wavelength) of the jth component. 486.1 nm) is shown.
ここで、曲率半径の符号は、物体側に凸面を向けた面形状のものを正とし、像側に凸面を向けた面形状のものを負としている。表1には光学部材Pおよび絞りStも含めて示しており、絞りStに相当する面の面番号の欄には面番号と(St)という語句を記載している。Diの最下欄の値は表中の最も像側の面と結像面Simとの間隔である。表1では変倍の際に変化する可変面間隔については、DD[ ]という記号を用い、[ ]の中にこの間隔の物体側の面番号を付してDiの欄に記入している。
Here, the sign of the radius of curvature is positive for the surface shape with the convex surface facing the object side and negative for the surface shape with the convex surface facing the image side. Table 1 includes the optical member P and the diaphragm St, and the surface number column of the surface corresponding to the diaphragm St describes the surface number and the word (St). The value in the bottom column of Di is the distance between the most image side surface in the table and the imaging surface Sim. In Table 1, the variable surface interval that changes during zooming is indicated by the symbol DD [], and the surface number on the object side of this interval is given in [] and entered in the Di column.
表2に、図1のマスターレンズMLのズーム比Zr、全系の焦点距離f、FナンバーFNo.、最大全画角2ω、および可変面間隔をd線基準で示す。2ωの欄の(°)は単位が度であることを意味する。表2では、広角端状態の各値をWIDEと表記した欄に示し、望遠端状態の各値をTELEと表記した欄に示している。表1と表2の値は無限遠物体に合焦した状態のものである。
Table 2 shows the zoom ratio Zr, the focal length f of the entire system, the F number FNo. The maximum full field angle 2ω and the variable surface interval are shown on the d-line basis. (°) in the column of 2ω means that the unit is degree. In Table 2, each value in the wide-angle end state is shown in a column labeled WIDE, and each value in the telephoto end state is shown in a column labeled TELE. The values in Tables 1 and 2 are for a state in which an object at infinity is in focus.
表1では、非球面の面番号には*印を付しており、非球面の曲率半径の欄には近軸の曲率半径の数値を記載している。表3に、実施例1の非球面の非球面係数を示す。表3の非球面係数の数値の「E-n」(n:整数)は「×10-n」を意味する。非球面係数は、下式で表される非球面式における各係数KA、Am(m=3、4、5、…11)の値である。
In Table 1, the surface number of the aspheric surface is marked with *, and the numerical value of the paraxial curvature radius is described in the column of curvature radius of the aspheric surface. Table 3 shows the aspheric coefficients of the aspheric surface of Example 1. The numerical value “E−n” (n: integer) of the aspheric coefficient in Table 3 means “× 10 −n ”. The aspheric coefficient is a value of each coefficient KA, Am (m = 3, 4, 5,... 11) in the aspheric expression represented by the following expression.
Zd:非球面深さ(高さhの非球面上の点から、非球面頂点が接する光軸に垂直な平面に
下ろした垂線の長さ)
h:高さ(光軸からのレンズ面までの距離)
C:近軸曲率
KA、Am:非球面係数
Zd: Depth of aspheric surface (length of perpendicular drawn from a point on the aspherical surface of height h to a plane perpendicular to the optical axis where the aspherical vertex contacts)
h: Height (distance from the optical axis to the lens surface)
C: Paraxial curvature KA, Am: Aspheric coefficient
各表のデータにおいて、角度の単位としては度を用い、長さの単位としてはmmを用いているが、光学系は比例拡大または比例縮小しても使用可能なため他の適当な単位を用いることもできる。また、以下に示す各表では所定の桁でまるめた数値を記載している。
In the data of each table, degree is used as the unit of angle and mm is used as the unit of length, but other suitable units are used because the optical system can be used even with proportional enlargement or reduction. You can also. In the following tables, numerical values rounded by a predetermined digit are described.
図5に、表1のマスターレンズMLの無限遠物体に合焦した状態での各収差図を示す。図5のWIDEと付した上段に左から順に広角端での球面収差、非点収差、歪曲収差(ディストーション)、および倍率色収差(倍率の色収差)を示し、TELEと付した下段に左から順に望遠端での球面収差、非点収差、歪曲収差、および倍率色収差を示す。球面収差図では、d線(波長587.6nm)、C線(波長656.3nm)、F線(波長486.1nm)、およびg線(波長435.8nm)に関する収差をそれぞれ実線、長破線、短破線、および灰色の実線で示す。非点収差図では、サジタル方向のd線に関する収差を実線で示し、タンジェンシャル方向のd線に関する収差を短破線で示す。歪曲収差図ではd線に関する収差を実線で示す。倍率色収差図では、C線、F線、およびg線に関する収差をそれぞれ長破線、短破線、および灰色の実線で示す。球面収差図のFNo.はFナンバーを意味し、その他の収差図のωは半画角を意味する。
FIG. 5 shows aberration diagrams in the state where the master lens ML in Table 1 is focused on an object at infinity. 5 shows spherical aberration, astigmatism, distortion (distortion), and chromatic aberration of magnification (chromatic aberration of magnification) in order from the left in the upper row labeled WIDE, and telephoto in the lower row labeled TELE from the left. Shows spherical aberration, astigmatism, distortion, and lateral chromatic aberration at the edges. In the spherical aberration diagram, aberrations relating to the d-line (wavelength 587.6 nm), the C-line (wavelength 656.3 nm), the F-line (wavelength 486.1 nm), and the g-line (wavelength 435.8 nm) are shown as a solid line, a long broken line, Indicated by a short dashed line and a gray solid line. In the astigmatism diagram, the aberration related to the d-line in the sagittal direction is indicated by a solid line, and the aberration related to the d-line in the tangential direction is indicated by a short broken line. In the distortion diagram, the aberration regarding the d-line is shown by a solid line. In the lateral chromatic aberration diagram, aberrations relating to C-line, F-line, and g-line are indicated by a long broken line, a short broken line, and a gray solid line, respectively. FNo. Means F number, and ω in other aberration diagrams means half angle of view.
[実施例1]
実施例1のエクステンダーレンズEXの構成図は図2に示したものである。実施例1のエクステンダーレンズEXは、物体側から順に、正の屈折力を有する第1レンズ群G1と、負の屈折力を有する第2レンズ群G2とからなる。第1レンズ群G1は、物体側から順に、両凸形状のレンズL11と、物体側に凸面を向けた正メニスカス形状のレンズL12と、両凸形状のレンズL13と、両凹形状のレンズL14と、両凸形状のレンズL15とからなる。レンズL13~L15は接合されて3枚接合レンズ3CEを構成している。第2レンズ群G2は、物体側から順に、両凹形状のレンズL21と、物体側に凸面を向けた正メニスカス形状のレンズL22とからなる。レンズL21とレンズL22は接合されている。 [Example 1]
A configuration diagram of the extender lens EX of the first embodiment is shown in FIG. The extender lens EX according to the first exemplary embodiment includes, in order from the object side, a first lens group G1 having a positive refractive power and a second lens group G2 having a negative refractive power. The first lens group G1 includes, in order from the object side, a biconvex lens L11, a positive meniscus lens L12 having a convex surface facing the object side, a biconvex lens L13, and a biconcave lens L14. And a biconvex lens L15. The lenses L13 to L15 are cemented to form a three-lens cemented lens 3CE. The second lens group G2 includes, in order from the object side, a biconcave lens L21 and a positive meniscus lens L22 with a convex surface facing the object side. The lens L21 and the lens L22 are cemented.
実施例1のエクステンダーレンズEXの構成図は図2に示したものである。実施例1のエクステンダーレンズEXは、物体側から順に、正の屈折力を有する第1レンズ群G1と、負の屈折力を有する第2レンズ群G2とからなる。第1レンズ群G1は、物体側から順に、両凸形状のレンズL11と、物体側に凸面を向けた正メニスカス形状のレンズL12と、両凸形状のレンズL13と、両凹形状のレンズL14と、両凸形状のレンズL15とからなる。レンズL13~L15は接合されて3枚接合レンズ3CEを構成している。第2レンズ群G2は、物体側から順に、両凹形状のレンズL21と、物体側に凸面を向けた正メニスカス形状のレンズL22とからなる。レンズL21とレンズL22は接合されている。 [Example 1]
A configuration diagram of the extender lens EX of the first embodiment is shown in FIG. The extender lens EX according to the first exemplary embodiment includes, in order from the object side, a first lens group G1 having a positive refractive power and a second lens group G2 having a negative refractive power. The first lens group G1 includes, in order from the object side, a biconvex lens L11, a positive meniscus lens L12 having a convex surface facing the object side, a biconvex lens L13, and a biconcave lens L14. And a biconvex lens L15. The lenses L13 to L15 are cemented to form a three-lens cemented lens 3CE. The second lens group G2 includes, in order from the object side, a biconcave lens L21 and a positive meniscus lens L22 with a convex surface facing the object side. The lens L21 and the lens L22 are cemented.
表4に、実施例1のエクステンダーレンズEXの基本レンズデータを示す。表4で用いている記号や記載方法は基本的に表1のものと同様である。ただし、光学部材Pおよび絞りStは表4には無い点、および表4ではDiの最下欄が空白である点は表1のものと異なる。このエクステンダーレンズEXは、表1のマスターレンズMLの39面と40面の間に挿脱自在に配される。このエクステンダーレンズEXをマスターレンズMLに挿入する際の、マスターレンズMLの39面とエクステンダーレンズEXの最も物体側の面との空気間隔、およびエクステンダーレンズEXの最も像側の面とマスターレンズMLの40面との空気間隔を表4の枠外下方にそれぞれ「マスターレンズの39面との空気間隔」および「マスターレンズの40面との空気間隔」として示す。
Table 4 shows basic lens data of the extender lens EX of Example 1. The symbols and description methods used in Table 4 are basically the same as those in Table 1. However, the optical member P and the aperture stop St are different from those in Table 1 in that they are not in Table 4 and in Table 4 the bottom column of Di is blank. The extender lens EX is detachably disposed between the 39th and 40th surfaces of the master lens ML shown in Table 1. When the extender lens EX is inserted into the master lens ML, the air gap between the 39th surface of the master lens ML and the most object side surface of the extender lens EX, and the most image side surface of the extender lens EX and the master lens ML. The air spacing from the 40th surface is shown as “air spacing from the 39th surface of the master lens” and “air spacing from the 40th surface of the master lens” respectively below the frame in Table 4.
表5に、実施例1のエクステンダーレンズEXを表1の39面と40面の間に挿入した全系の諸元として、ズーム比Zr、全系の焦点距離f、FナンバーFNo.、および最大全画角2ωをd線基準で示す。ここでいう全系とは、マスターレンズML、エクステンダーレンズEX、および光学部材Pからなる系である。
Table 5 shows the specifications of the entire system in which the extender lens EX of Example 1 is inserted between the 39th surface and the 40th surface of Table 1. The zoom ratio Zr, the focal length f of the entire system, the F number FNo. , And the maximum total angle of view 2ω on the d-line basis. The whole system here is a system including the master lens ML, the extender lens EX, and the optical member P.
図6に、実施例1のエクステンダーレンズEXを表1の39面と40面の間に挿入した全系の無限遠物体に合焦した状態での各収差図を示す。図6で用いている記号や記載方法は基本的に図5のものと同様である。
FIG. 6 shows aberration diagrams in a state in which the extender lens EX of Example 1 is focused on an infinitely distant object inserted between the 39th and 40th surfaces in Table 1. The symbols and description methods used in FIG. 6 are basically the same as those in FIG.
上記の実施例1のエクステンダーレンズEXに関する図示方法、各データの記号、および記載方法等は、特に断りがない限り以下の実施例のものについても同様であるため、以下では重複説明を省略する。
The illustration method, the symbol of each data, the description method, and the like regarding the extender lens EX of the first embodiment are the same for the following embodiments unless otherwise specified, and therefore, the duplicate description is omitted below.
[実施例2]
図3に、実施例2のエクステンダーレンズEXの構成図を示す。実施例2のエクステンダーレンズEXは、物体側から順に、正の屈折力を有する第1レンズ群G1と、負の屈折力を有する第2レンズ群G2とからなる。第1レンズ群G1はレンズL11~L15からなり、第2レンズ群G2はレンズL21~L22からなる。実施例2の全レンズの凹凸形状および屈折力の符号、および接合されているレンズは実施例1のものと同じである。 [Example 2]
FIG. 3 shows a configuration diagram of the extender lens EX of the second embodiment. The extender lens EX of Example 2 includes, in order from the object side, a first lens group G1 having a positive refractive power and a second lens group G2 having a negative refractive power. The first lens group G1 includes lenses L11 to L15, and the second lens group G2 includes lenses L21 to L22. The concave / convex shape of all the lenses in Example 2 and the signs of refractive power, and the joined lenses are the same as those in Example 1.
図3に、実施例2のエクステンダーレンズEXの構成図を示す。実施例2のエクステンダーレンズEXは、物体側から順に、正の屈折力を有する第1レンズ群G1と、負の屈折力を有する第2レンズ群G2とからなる。第1レンズ群G1はレンズL11~L15からなり、第2レンズ群G2はレンズL21~L22からなる。実施例2の全レンズの凹凸形状および屈折力の符号、および接合されているレンズは実施例1のものと同じである。 [Example 2]
FIG. 3 shows a configuration diagram of the extender lens EX of the second embodiment. The extender lens EX of Example 2 includes, in order from the object side, a first lens group G1 having a positive refractive power and a second lens group G2 having a negative refractive power. The first lens group G1 includes lenses L11 to L15, and the second lens group G2 includes lenses L21 to L22. The concave / convex shape of all the lenses in Example 2 and the signs of refractive power, and the joined lenses are the same as those in Example 1.
表6に、実施例2のエクステンダーレンズEXの基本レンズデータを示す。表7に、実施例2のエクステンダーレンズEXを表1の39面と40面の間に挿入した全系の諸元を示し、図7に、この全系の無限遠物体に合焦した状態での各収差図を示す。
Table 6 shows basic lens data of the extender lens EX of Example 2. Table 7 shows the specifications of the entire system in which the extender lens EX of Example 2 was inserted between the 39th and 40th surfaces of Table 1, and FIG. 7 shows a state where the entire system is focused on an infinite object. Each aberration diagram is shown.
[実施例3]
図4に、実施例3のエクステンダーレンズEXの構成図を示す。実施例3のエクステンダーレンズEXは、物体側から順に、正の屈折力を有する第1レンズ群G1と、負の屈折力を有する第2レンズ群G2とからなる。第1レンズ群G1は、物体側から順に、両凸形状のレンズL11と、両凸形状のレンズL12と、両凹形状のレンズL13と、両凸形状のレンズL14とからなる。レンズL12~L14は接合されて3枚接合レンズ3CEを構成している。第2レンズ群G2はレンズL21~L22からなる。実施例3の第2レンズ群G2の全レンズの凹凸形状および屈折力の符号、および接合されているレンズは実施例1のものと同じである。 [Example 3]
FIG. 4 shows a configuration diagram of the extender lens EX of the third embodiment. The extender lens EX of Example 3 includes, in order from the object side, a first lens group G1 having a positive refractive power and a second lens group G2 having a negative refractive power. The first lens group G1 includes, in order from the object side, a biconvex lens L11, a biconvex lens L12, a biconcave lens L13, and a biconvex lens L14. The lenses L12 to L14 are cemented to form a three-lens cemented lens 3CE. The second lens group G2 includes lenses L21 to L22. The concave / convex shape and the sign of refractive power of all the lenses in the second lens group G2 of Example 3 and the joined lenses are the same as those of Example 1.
図4に、実施例3のエクステンダーレンズEXの構成図を示す。実施例3のエクステンダーレンズEXは、物体側から順に、正の屈折力を有する第1レンズ群G1と、負の屈折力を有する第2レンズ群G2とからなる。第1レンズ群G1は、物体側から順に、両凸形状のレンズL11と、両凸形状のレンズL12と、両凹形状のレンズL13と、両凸形状のレンズL14とからなる。レンズL12~L14は接合されて3枚接合レンズ3CEを構成している。第2レンズ群G2はレンズL21~L22からなる。実施例3の第2レンズ群G2の全レンズの凹凸形状および屈折力の符号、および接合されているレンズは実施例1のものと同じである。 [Example 3]
FIG. 4 shows a configuration diagram of the extender lens EX of the third embodiment. The extender lens EX of Example 3 includes, in order from the object side, a first lens group G1 having a positive refractive power and a second lens group G2 having a negative refractive power. The first lens group G1 includes, in order from the object side, a biconvex lens L11, a biconvex lens L12, a biconcave lens L13, and a biconvex lens L14. The lenses L12 to L14 are cemented to form a three-lens cemented lens 3CE. The second lens group G2 includes lenses L21 to L22. The concave / convex shape and the sign of refractive power of all the lenses in the second lens group G2 of Example 3 and the joined lenses are the same as those of Example 1.
表8に、実施例3のエクステンダーレンズEXの基本レンズデータを示す。表9に、実施例3のエクステンダーレンズEXを表1の39面と40面の間に挿入した全系の諸元を示し、図8に、この全系の無限遠物体に合焦した状態での各収差図を示す。
Table 8 shows basic lens data of the extender lens EX of Example 3. Table 9 shows the specifications of the entire system in which the extender lens EX of Example 3 was inserted between the 39th surface and the 40th surface of Table 1, and FIG. 8 shows a state where the entire system is focused on an infinite object. Each aberration diagram is shown.
表10に上記実施例1~3のエクステンダーレンズEXの条件式(1)~(8)の対応値を示す。表10に示す値は、条件式(7)の対応値以外はd線を基準としたものである。
Table 10 shows the corresponding values of the conditional expressions (1) to (8) of the extender lens EX of Examples 1 to 3 above. The values shown in Table 10 are based on the d-line except for the corresponding values in conditional expression (7).
次に、本発明の実施形態に係る撮像装置について説明する。図9に、本発明の実施形態の撮像装置の一例として、本発明の実施形態に係るエクステンダーレンズEXを用いた撮像装置10の概略構成図を示す。撮像装置10としては、例えば、映画撮影用カメラ、放送用カメラ、デジタルカメラ、ビデオカメラ、または監視用カメラ等を挙げることができる。
Next, an imaging device according to an embodiment of the present invention will be described. FIG. 9 shows a schematic configuration diagram of an imaging apparatus 10 using the extender lens EX according to the embodiment of the present invention as an example of the imaging apparatus of the embodiment of the present invention. Examples of the imaging device 10 include a movie camera, a broadcast camera, a digital camera, a video camera, and a surveillance camera.
撮像装置10は、マスターレンズMLと、マスターレンズMLの内部に挿脱自在に配されるエクステンダーレンズEXと、マスターレンズMLの像側に配置されたフィルタ2と、フィルタ2の像側に配置された撮像素子3と、撮像素子3からの出力信号を演算処理する信号処理部4と、レンズ系の変倍を制御する変倍制御部5とを備えている。なお、図9では、エクステンダーレンズEXとマスターレンズMLが備える各レンズ群を概略的に図示している。撮像素子3は光学像を電気信号に変換するものであり、例えば、CCD(Charge Coupled Device)またはCMOS(Complementary Metal Oxide Semiconductor)等を用いることができる。撮像素子3は、その撮像面がマスターレンズMLの結像面に一致するように配置される。なお、図9では1つの撮像素子3のみ図示しているが、本発明の撮像装置はこれに限定されず、3つの撮像素子を有するいわゆる3板方式の撮像装置であってもよい。変倍制御部5によりマスターレンズMLの変倍およびエクステンダーレンズEXの挿脱が行われる。
The imaging device 10 is disposed on the image side of the master lens ML, the extender lens EX that is detachably disposed in the master lens ML, the filter 2 disposed on the image side of the master lens ML, and the image side of the filter 2. The image pickup device 3, a signal processing unit 4 that performs arithmetic processing on an output signal from the image pickup device 3, and a zoom control unit 5 that controls zooming of the lens system. In addition, in FIG. 9, each lens group with which the extender lens EX and the master lens ML are provided is schematically illustrated. The imaging device 3 converts an optical image into an electrical signal, and for example, a CCD (Charge-Coupled Device) or a CMOS (Complementary Metal-Oxide Semiconductor) can be used. The image pickup device 3 is arranged so that the image pickup surface thereof coincides with the image formation surface of the master lens ML. Although only one image sensor 3 is shown in FIG. 9, the image pickup apparatus of the present invention is not limited to this, and may be a so-called three-plate type image pickup apparatus having three image pickup elements. The magnification control unit 5 performs magnification of the master lens ML and insertion / removal of the extender lens EX.
以上、実施形態および実施例を挙げて本発明を説明したが、本発明は上記実施形態および実施例に限定されず、種々の変形が可能である。例えば、各レンズの曲率半径、面間隔、屈折率、アッベ数、および部分分散比等は、上記各数値実施例で示した値に限定されず、他の値をとり得る。また、本発明を適用可能なマスターレンズは上記例のものに限定されず、他の構成のズームレンズ、バリフォーカルレンズ、または固定焦点光学系でもよい。
The present invention has been described with reference to the embodiments and examples. However, the present invention is not limited to the above-described embodiments and examples, and various modifications can be made. For example, the curvature radius, the surface interval, the refractive index, the Abbe number, the partial dispersion ratio, and the like of each lens are not limited to the values shown in the above numerical examples, and may take other values. In addition, the master lens to which the present invention can be applied is not limited to the above example, and may be a zoom lens, a varifocal lens, or a fixed focus optical system having another configuration.
2 フィルタ
3 撮像素子
3CE 3枚接合レンズ
4 信号処理部
5 変倍制御部
10 撮像装置
C コンペンセーターレンズ群
EX エクステンダーレンズ
F フォーカスレンズ群
G1 第1レンズ群
G2 第2レンズ群
L11~L15、L21、L22 レンズ
ML マスターレンズ
P 光学部材
RF リレーレンズ前群
RR リレーレンズ後群
Sim 結像面
St 絞り
V バリエーターレンズ群
Z 光軸Reference Signs List 2 Filter 3 Image sensor 3CE Three-piece cemented lens 4 Signal processing unit 5 Scaling control unit 10 Imaging device C Compensator lens group EX Extender lens F Focus lens group G1 First lens group G2 Second lens group L11 to L15, L21, L22 lens ML master lens P optical member RF relay lens front group RR relay lens rear group Sim imaging surface St stop V variator lens group Z optical axis
3 撮像素子
3CE 3枚接合レンズ
4 信号処理部
5 変倍制御部
10 撮像装置
C コンペンセーターレンズ群
EX エクステンダーレンズ
F フォーカスレンズ群
G1 第1レンズ群
G2 第2レンズ群
L11~L15、L21、L22 レンズ
ML マスターレンズ
P 光学部材
RF リレーレンズ前群
RR リレーレンズ後群
Sim 結像面
St 絞り
V バリエーターレンズ群
Z 光軸
Claims (20)
- 撮像用のマスターレンズの内部に挿脱自在に配されて、結像位置を一定に保ったまま挿入後のレンズ全系の焦点距離を前記マスターレンズの焦点距離よりも長くするエクステンダーレンズであって、
物体側から順に、全体として正の屈折力を有する第1レンズ群と、全体として負の屈折力を有する第2レンズ群とからなり、
前記第1レンズ群は、物体側から順に、1枚以上の正レンズと、物体側から順に正レンズ、負レンズ、および正レンズの3枚のレンズが接合された3枚接合レンズとからなり、
下記条件式(1)を満足することを特徴とするエクステンダーレンズ。
26<ν1n<40 (1)
ただし、
ν1n:前記3枚接合レンズを構成する前記負レンズのd線基準のアッベ数 An extender lens, which is detachably arranged inside an imaging master lens, and makes the focal length of the entire lens system after insertion longer than the focal length of the master lens while maintaining a constant imaging position. ,
In order from the object side, the first lens group having a positive refractive power as a whole and a second lens group having a negative refractive power as a whole,
The first lens group includes one or more positive lenses in order from the object side, and a three-piece cemented lens in which three lenses, a positive lens, a negative lens, and a positive lens are cemented in order from the object side.
An extender lens that satisfies the following conditional expression (1):
26 <ν1n <40 (1)
However,
ν1n: d-line reference Abbe number of the negative lens constituting the three-piece cemented lens - 下記条件式(2)を満足する請求項1記載のエクステンダーレンズ。
25<ν1pa-ν1n<35 (2)
ただし、
ν1pa:前記第1レンズ群を構成する正レンズのd線基準のアッベ数の平均 The extender lens according to claim 1, wherein the following conditional expression (2) is satisfied.
25 <ν1pa−ν1n <35 (2)
However,
ν1pa: Average Abbe number of the d-line reference of the positive lens constituting the first lens group - 下記条件式(3)を満足する請求項1または2記載のエクステンダーレンズ。
-5<f1/f1n<-2 (3)
ただし、
f1:前記第1レンズ群の焦点距離
f1n:前記3枚接合レンズを構成する前記負レンズの焦点距離 The extender lens according to claim 1 or 2, wherein the following conditional expression (3) is satisfied.
-5 <f1 / f1n <-2 (3)
However,
f1: Focal length of the first lens group f1n: Focal length of the negative lens constituting the three-piece cemented lens - 前記第2レンズ群は、1枚以上の正レンズと、1枚以上の負レンズとからなり、
下記条件式(4)を満足する請求項1から3のいずれか1項記載のエクステンダーレンズ。
1.8<N2a<2.05 (4)
ただし、
N2a:前記第2レンズ群を構成するレンズのd線に対する屈折率の平均 The second lens group includes one or more positive lenses and one or more negative lenses,
The extender lens according to any one of claims 1 to 3, wherein the following conditional expression (4) is satisfied.
1.8 <N2a <2.05 (4)
However,
N2a: Average refractive index with respect to d-line of lenses constituting the second lens group - 前記第2レンズ群は、1枚以上の負レンズと、1枚以上の正レンズとからなり、
下記条件式(5)を満足する請求項1から4のいずれか1項記載のエクステンダーレンズ。
-0.1<N2na-N2pa<0 (5)
ただし、
N2na:前記第2レンズ群が複数の負レンズを有する場合は前記第2レンズ群を構成する負レンズのd線に対する屈折率の平均であり、前記第2レンズ群が1枚のみ負レンズを有する場合は該負レンズのd線に対する屈折率
N2pa:前記第2レンズ群が複数の正レンズを有する場合は前記第2レンズ群を構成する正レンズのd線に対する屈折率の平均であり、前記第2レンズ群が1枚のみ正レンズを有する場合は該正レンズのd線に対する屈折率 The second lens group includes one or more negative lenses and one or more positive lenses.
The extender lens according to any one of claims 1 to 4, wherein the following conditional expression (5) is satisfied.
-0.1 <N2na-N2pa <0 (5)
However,
N2na: When the second lens group has a plurality of negative lenses, it is the average of the refractive indices with respect to the d-line of the negative lenses constituting the second lens group, and the second lens group has only one negative lens. In this case, the refractive index N2pa with respect to the d-line of the negative lens is the average refractive index with respect to the d-line of the positive lens constituting the second lens group when the second lens group has a plurality of positive lenses. When two lens units have only one positive lens, the refractive index of the positive lens with respect to the d-line - 下記条件式(6)を満足する請求項1から5のいずれか1項記載のエクステンダーレンズ。
1.9<N1n<2.05 (6)
ただし、
N1n:前記3枚接合レンズを構成する前記負レンズのd線に対する屈折率 The extender lens according to any one of claims 1 to 5, wherein the following conditional expression (6) is satisfied.
1.9 <N1n <2.05 (6)
However,
N1n: refractive index with respect to d-line of the negative lens constituting the three-piece cemented lens - 下記条件式(7)を満足する請求項1から6のいずれか1項記載のエクステンダーレンズ。
0.55<θ1n<0.605 (7)
ただし、
θ1n:前記3枚接合レンズを構成する前記負レンズのg線とF線間の部分分散比 The extender lens according to any one of claims 1 to 6, wherein the following conditional expression (7) is satisfied.
0.55 <θ1n <0.605 (7)
However,
θ1n: partial dispersion ratio between g-line and F-line of the negative lens constituting the three-piece cemented lens - 下記条件式(8)を満足する請求項1から7のいずれか1項記載のエクステンダーレンズ。
0.3<N1n-N1pa<0.5(8)
ただし、
N1n:前記3枚接合レンズを構成する前記負レンズのd線に対する屈折率
N1pa:前記第1レンズ群を構成する正レンズのd線に対する屈折率の平均 The extender lens according to any one of claims 1 to 7, wherein the following conditional expression (8) is satisfied.
0.3 <N1n-N1pa <0.5 (8)
However,
N1n: Refractive index with respect to d-line of the negative lens constituting the three-piece cemented lens N1pa: Average refractive index with respect to d-line of the positive lens constituting the first lens group - 前記3枚接合レンズより物体側に配置される前記第1レンズ群の正レンズは2枚以下である請求項1から8のいずれか1項に記載のエクステンダーレンズ。 The extender lens according to any one of claims 1 to 8, wherein the number of positive lenses in the first lens group disposed on the object side relative to the three-piece cemented lens is two or less.
- 前記第2レンズ群は2枚のレンズからなる請求項1から9のいずれか1項記載のエクステンダーレンズ。 The extender lens according to any one of claims 1 to 9, wherein the second lens group includes two lenses.
- 前記第2レンズ群は、負レンズおよび正レンズが接合された接合レンズからなる請求項10記載のエクステンダーレンズ。 The extender lens according to claim 10, wherein the second lens group includes a cemented lens in which a negative lens and a positive lens are cemented.
- 下記条件式(1-1)を満足する請求項1から11のいずれか1項記載のエクステンダーレンズ。
28<ν1n<35 (1-1) The extender lens according to claim 1, wherein the following conditional expression (1-1) is satisfied.
28 <ν1n <35 (1-1) - 下記条件式(2-1)を満足する請求項1から12のいずれか1項記載のエクステンダーレンズ。
25<ν1pa-ν1n<32 (2-1)
ただし、
ν1pa:前記第1レンズ群を構成する正レンズのd線基準のアッベ数の平均 The extender lens according to any one of claims 1 to 12, wherein the following conditional expression (2-1) is satisfied.
25 <ν1pa−ν1n <32 (2-1)
However,
ν1pa: Average Abbe number of the d-line reference of the positive lens constituting the first lens group - 下記条件式(3-1)を満足する請求項1から13のいずれか1項記載のエクステンダーレンズ。
-3.5<f1/f1n<-2.7 (3-1)
ただし、
f1:前記第1レンズ群の焦点距離
f1n:前記3枚接合レンズを構成する前記負レンズの焦点距離 The extender lens according to any one of claims 1 to 13, wherein the following conditional expression (3-1) is satisfied.
−3.5 <f1 / f1n <−2.7 (3-1)
However,
f1: Focal length of the first lens group f1n: Focal length of the negative lens constituting the three-piece cemented lens - 前記第2レンズ群は、1枚以上の正レンズと、1枚以上の負レンズとからなり、
下記条件式(4-1)を満足する請求項1から14のいずれか1項記載のエクステンダーレンズ。
1.85<N2a<2.05 (4-1)
ただし、
N2a:前記第2レンズ群を構成するレンズのd線に対する屈折率の平均 The second lens group includes one or more positive lenses and one or more negative lenses,
The extender lens according to claim 1, wherein the following conditional expression (4-1) is satisfied.
1.85 <N2a <2.05 (4-1)
However,
N2a: Average refractive index with respect to d-line of lenses constituting the second lens group - 前記第2レンズ群は、1枚以上の正レンズと、1枚以上の負レンズとからなり、
下記条件式(5-1)を満足する請求項1から15のいずれか1項記載のエクステンダーレンズ。
-0.06<N2na-N2pa<0 (5-1)
ただし、
N2na:前記第2レンズ群が複数の負レンズを有する場合は前記第2レンズ群を構成する負レンズのd線に対する屈折率の平均であり、前記第2レンズ群が1枚のみ負レンズを有する場合は該負レンズのd線に対する屈折率
N2pa:前記第2レンズ群が複数の正レンズを有する場合は前記第2レンズ群を構成する正レンズのd線に対する屈折率の平均であり、前記第2レンズ群が1枚のみ正レンズを有する場合は該正レンズのd線に対する屈折率 The second lens group includes one or more positive lenses and one or more negative lenses,
The extender lens according to any one of claims 1 to 15, wherein the following conditional expression (5-1) is satisfied.
-0.06 <N2na-N2pa <0 (5-1)
However,
N2na: When the second lens group has a plurality of negative lenses, it is the average of the refractive indices with respect to the d-line of the negative lenses constituting the second lens group, and the second lens group has only one negative lens. In this case, the refractive index N2pa with respect to the d-line of the negative lens is the average refractive index with respect to the d-line of the positive lens constituting the second lens group when the second lens group has a plurality of positive lenses. When two lens units have only one positive lens, the refractive index of the positive lens with respect to the d-line - 下記条件式(6-1)を満足する請求項1から16のいずれか1項記載のエクステンダーレンズ。
1.95<N1n<2.05 (6-1)
ただし、
N1n:前記3枚接合レンズを構成する前記負レンズのd線に対する屈折率 The extender lens according to any one of claims 1 to 16, wherein the following conditional expression (6-1) is satisfied.
1.95 <N1n <2.05 (6-1)
However,
N1n: refractive index with respect to d-line of the negative lens constituting the three-piece cemented lens - 下記条件式(7-1)を満足する請求項1から17のいずれか1項記載のエクステンダーレンズ。
0.57<θ1n<0.6 (7-1)
ただし、
θ1n:前記3枚接合レンズを構成する前記負レンズのg線とF線間の部分分散比 The extender lens according to any one of claims 1 to 17, wherein the following conditional expression (7-1) is satisfied.
0.57 <θ1n <0.6 (7-1)
However,
θ1n: partial dispersion ratio between g-line and F-line of the negative lens constituting the three-piece cemented lens - 下記条件式(8-1)を満足する請求項1から18のいずれか1項記載のエクステンダーレンズ。
0.33<N1n-N1pa<0.45(8-1)
ただし、
N1n:前記3枚接合レンズを構成する前記負レンズのd線に対する屈折率
N1pa:前記第1レンズ群を構成する正レンズのd線に対する屈折率の平均 The extender lens according to claim 1, wherein the following conditional expression (8-1) is satisfied.
0.33 <N1n-N1pa <0.45 (8-1)
However,
N1n: Refractive index with respect to d-line of the negative lens constituting the three-piece cemented lens N1pa: Average refractive index with respect to d-line of the positive lens constituting the first lens group - 請求項1から19のいずれか1項記載のエクステンダーレンズを備えた撮像装置。 An imaging apparatus comprising the extender lens according to any one of claims 1 to 19.
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CN201780016050.0A CN108713158B (en) | 2016-03-16 | 2017-02-27 | Extender lens and photographic device |
JP2018505777A JP6454053B2 (en) | 2016-03-16 | 2017-02-27 | Extender lens and imaging device |
US16/120,475 US10698187B2 (en) | 2016-03-16 | 2018-09-04 | Extender lens and imaging apparatus |
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Cited By (4)
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JP2019120746A (en) * | 2017-12-28 | 2019-07-22 | オリンパス株式会社 | Imaging optical system and imaging apparatus with the same |
JP2020042062A (en) * | 2018-09-06 | 2020-03-19 | キヤノン株式会社 | Zoom lens, image capturing device, and extender lens group |
JP2021039225A (en) * | 2019-09-03 | 2021-03-11 | キヤノン株式会社 | Extender lens group, zoom lens, and image capturing device |
KR20210087514A (en) * | 2018-11-09 | 2021-07-12 | 스냅 인코포레이티드 | Projection lens with four spherical glass elements |
Families Citing this family (1)
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US11675173B2 (en) * | 2019-09-30 | 2023-06-13 | Fujifilm Corporation | Extender lens, optical system, and imaging apparatus |
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- 2017-02-27 JP JP2018505777A patent/JP6454053B2/en active Active
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JPH11183800A (en) * | 1997-12-24 | 1999-07-09 | Canon Inc | Diffraction refractive type rear attachment lens |
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JP7154896B2 (en) | 2018-09-06 | 2022-10-18 | キヤノン株式会社 | Zoom lens, imaging device and extender lens group |
KR20210087514A (en) * | 2018-11-09 | 2021-07-12 | 스냅 인코포레이티드 | Projection lens with four spherical glass elements |
KR102597609B1 (en) | 2018-11-09 | 2023-11-02 | 스냅 인코포레이티드 | Projection lens with four spherical glass elements |
JP2021039225A (en) * | 2019-09-03 | 2021-03-11 | キヤノン株式会社 | Extender lens group, zoom lens, and image capturing device |
JP7328084B2 (en) | 2019-09-03 | 2023-08-16 | キヤノン株式会社 | Extender lens group, zoom lens, and imaging device |
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JP6454053B2 (en) | 2019-01-16 |
CN108713158B (en) | 2019-07-23 |
CN108713158A (en) | 2018-10-26 |
US10698187B2 (en) | 2020-06-30 |
JPWO2017159325A1 (en) | 2018-11-29 |
US20180373001A1 (en) | 2018-12-27 |
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